![](http://datasheet.mmic.net.cn/Maxim-Integrated-Products/MXB7846EUE-T_datasheet_99093/MXB7846EUE-T_6.png)
Typical Operating Characteristics (continued)
(VDD = 2.7V, VREF = 2.5VEXTERNAL, fDCLK = 2MHz, fSAMPLE = 125kHz, CLOAD = 50pF, 0.1F capacitor at REF, TA = +25°C, unless
otherwise noted.)
MXB7846
2.375V to 5.25V, 4-Wire Touch-Screen Controller
with Internal Reference and Temperature Sensor
6
_______________________________________________________________________________________
INTERNAL REFERENCE VOLTAGE
vs. TEMPERATURE
MXB7846
toc10
TEMPERATURE (
°C)
INTERNAL
REFERENCE
VOLTAGE
(V)
80
65
50
35
20
5
-10
-25
2.1
2.2
2.3
2.4
2.5
2.6
2.0
-40
VDD = 2.7V
CL = 0.1
μF
INTERNAL VOLTAGE REFERENCE
vs. TURN-ON TIME
MXB7846
toc11a
TURN-ON TIME (
μs)
INTERNAL
VOLTAGE
REFERENCE
(V)
1200
1000
800
600
400
200
0.5
1.0
1.5
2.0
2.5
0
CL = 1
μF
(1060
μs) 12-BIT SETTLING
INTERNAL VOLTAGE REFERENCE
vs. TURN-ON TIME
MXB7846
toc11b
TURN-ON TIME (
μs)
INTERNAL
VOLTAGE
REFERENCE
(V)
35
30
25
20
15
10
5
0.5
1.0
1.5
2.0
2.5
3.0
0
040
NO CAPACITOR
(30
μs) 12-BIT SETTLING
REFERENCE CURRENT
vs. SUPPLY VOLTAGE
MXB7846
toc12
SUPPLY VOLTAGE (V)
REFERENCE
CURRENT
(μ
A)
5.0
4.5
4.0
3.5
3.0
7.8
7.9
8.0
8.1
8.2
8.3
7.7
2.5
5.5
CL = 0.1
μF
fSAMPLE = 125kHz
EXTERNAL REFERENCE
REFERENCE CURRENT vs. TEMPERATURE
MXB7846
toc13
TEMPERATURE (
°C)
REFERENCE
CURRENT
(μ
A)
65
50
35
20
5
-10
-25
7.8
7.9
8.0
8.1
8.2
8.3
7.7
-40
80
VDD = 2.7V
CL = 0.1
μF
fSAMPLE = 125kHz
EXTERNAL REFERENCE
REFERENCE CURRENT vs. SAMPLE RATE
MXB7846
toc14
SAMPLE RATE (kHz)
REFERENCE
CURRENT
(μ
A)
100
75
50
25
1
2
3
4
5
6
7
8
9
10
0
125
EXTERNAL REFERENCE
TEMP DIODE VOLTAGE
vs. TEMPERATURE
MXB7846
toc15
TEMPERATURE (
°C)
TEMP
DIODE
VOLTAGE
(V)
80
65
35
50
-10
5
20
-25
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0
-40
TEMP1
TEMP2
TEMP0 DIODE VOLTAGE
vs. SUPPLY VOLTAGE
MXB7846
toc16
SUPPLY VOLTAGE (V)
TEMP0
DIODE
VOLTAGE
(mV)
5.2
4.7
4.2
3.7
3.2
586
587
588
589
590
585
2.7
TEMP0
TEMP1 DIODE VOLTAGE
vs. SUPPLY VOLTAGE
MXB7846
toc17
SUPPLY VOLTAGE (V)
TEMP1
DIODE
VOLTAGE
(mV)
5.2
4.7
4.2
3.7
3.2
699
700
701
702
703
704
705
698
2.7
TEMP1